/** Proxy factory that allows the composition of before and after callbacks on existing factories. */
export class SerializationWriterProxyFactory {
    getValidContentType() {
        return this._concrete.getValidContentType();
    }
    /**
     * Creates a new proxy factory that wraps the specified concrete factory while composing the before and after callbacks.
     * @param _concrete the concrete factory to wrap
     * @param _onBefore the callback to invoke before the serialization of any model object.
     * @param _onAfter the callback to invoke after the serialization of any model object.
     * @param _onStart the callback to invoke when the serialization of a model object starts
     */
    constructor(_concrete, _onBefore, _onAfter, _onStart) {
        this._concrete = _concrete;
        this._onBefore = _onBefore;
        this._onAfter = _onAfter;
        this._onStart = _onStart;
        if (!_concrete) {
            throw new Error("_concrete cannot be undefined");
        }
    }
    getSerializationWriter(contentType) {
        const writer = this._concrete.getSerializationWriter(contentType);
        const originalBefore = writer.onBeforeObjectSerialization;
        const originalAfter = writer.onAfterObjectSerialization;
        const originalStart = writer.onStartObjectSerialization;
        writer.onBeforeObjectSerialization = (value) => {
            if (this._onBefore)
                this._onBefore(value);
            if (originalBefore)
                originalBefore(value);
        };
        writer.onAfterObjectSerialization = (value) => {
            if (this._onAfter)
                this._onAfter(value);
            if (originalAfter)
                originalAfter(value);
        };
        writer.onStartObjectSerialization = (value, writer_) => {
            if (this._onStart)
                this._onStart(value, writer_);
            if (originalStart)
                originalStart(value, writer_);
        };
        return writer;
    }
}
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